Release calc version 2.10.2t30

help/atan2

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+NAME
+    atan2 - angle to point
+
+SYNOPSIS
+    atan2(y, x, [,acc])
+
+TYPES
+    y		real
+    x		real
+    acc		real
+
+    return	real
+
+DESCRIPTION
+    Return the angle which is determined by the point (x,y).  This
+    function computes the arctangent of y/x in the range [-pi, pi].
+    The value acc specifies the accuracy of the result.  By default, acc
+    is epsilon().
+
+    Note that by convention, y is the first argument.
+
+    To conform to the 4.3BSD ANSI/IEEE 754-1985 math lib, atan2(0,0) is
+    defined to return 0.
+
+EXAMPLE
+    > print atan2(0,0), atan2(1,sqrt(3)), atan2(17,53,1e-100)
+    0 ~.52359877559829887307 ~.31038740713235146535
+
+LIMITS
+    acc > 0
+
+LIBRARY
+    NUMBER *qatan2(NUMBER *y, *x, *acc)
+
+SEE ALSO
+    acos, asin, atan, cos, epsilon, sin, tan